Playing golf with his buddies, my grandfather had to make a slick 45-foot, downhill putt. As he lined it up, he announced, "I have a dollar bill that says I can make this putt. Does anyone want to bet?"
His three friends eagerly agreed to the wager. My grandfather missed the putt by ten feet, and his friends gathered around to collect their money. Granddad pulled out a dollar bill on which he had printed, "I can make this putt."
His pals are still trying to collect on the bet; my grandfather is too.